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IMPROVEMENT IN PRESERVING WOOD.

Specification forming part of Letters Patent No. 129,503, dated J uly 16, 1872.

. SPECIFICATION railroad timbers and structures above ground To all whom at may concern: 1 the alkaline solution becomes of the greatest Be it known that 1, PETER W f th importance as a correctiveto the inflammable "city of St. Louis, in the St te f Mi i, character of the other ingredients, andalarger have invented aWood-Preserving Compound; Proportion ihzwollld therefore be required and I .do hereby declare the following to be a g Wood p y for Such P full and correct description of the same. IP

- My invention consists in the composition of The compound thus prepared is to be apa liquid mixture to be applied tothe preservaplied to Wood by brush by the tion of wood against decay from the a ti f of an open or closed tank, in which the wood water and marine worms, while rendering it 1 1- be immersed in the compound, which may less liable to destruction by fire'than it is in be subjected to pressure, if required.

its natural or unprepared state. c Having thus fully described my invention, In the preparation 0 mycompound I use the what I claim, and desire to secure by Letters following in gradients, viz.: Asphalt from coal- Patent, is aafi heavy oil from coal-tar so -as The wood-preserving compound hereinbee heaTvToiland asp a mix together while fore described, prepared by the addition of hot, and add to them a solution of sodar'ash an alkaline solution to the asphalt and heavy and lime in water, or in the heavy oil before oil from coal-tar, substantially in the manner mentioned, either hot or cold. The proper and for the purposes specified.

tions of the ingredients named I vary accord- The above specification of my said invening'to the use to which the treated wood is to tion signed and witnessed at St. Louis. be applied. When protection from the action PETER WELGH. of water and marine worms is the object in view, I use less of the alkaline solution than Witnesses:

when I desire to add protection against fire-to FRANCIS NOEL, the preservative qualities of the asphalt; For I Enw. S. WARNER. 

